Broadcast receiving system



AU8 27 1929- J. WEINBERGER 1,725,946

BROADCAST RECEIVING SYSTEM Filed April 19, 1927 [0l/0 SPEAKER INVENTOR JUUUS WElNBERGER AT RNEY Patented Aug. 27, 1929.

PATENT OFFICE.

AmICA, A CORPORATION OF DELAWARE.

BROADCAST BECEIVIN SYSTEM.-

Application led April 19, 1927. Serial No. 184,881.

This invention relates to the art of broadcast receiving systems and Adeals more speciflcally with a receiver designed forl use in connection withthe usual broadcasting fr equencies, or alternativelyfor use in connection with-the reception of wired radio pro- The operating frequencies used qin connection with wired radio are roughly within the range of 2i) to 150 kilo-cycles, whereas the present broadcasting band extends Vfrom 500 to 1500 ln'lo-c cles. It is, there ore, an object of thisinvention to provide a sin si 1n the form of broadcast speech or music either at the broadcast frenencies, orV for receiving programs at the frequencies used in connection with Wired radio. Y Y 'Die manner in which I carry out this invention'will be readily apparent to those skilled in the art from the following description, taken drawing in which, the single figure 25 is a dxgrammatic representation of a system embodying my invention.

in detail to the drawing, a conventional superheterodyne receiver is shown diagrammatlcally, which briefly consistsof the following apparatus. The antenna 11 and ground connection- 12 are connected to theradio ency' amplifier, whichis in turn conn Vto Vthe radio frequency detec'tor.Y The local oscillator is connected between these two members. The intermediate frequency ampliier,'detector, and audio frequency amplifier are shown diagrammatically, and'to this group of apparatus is connected the loudspeaker. A double-pole, 40 double-throw switch -13 is connected to the intermediate frequency amplilier and is adapted to make contact selectively, either with the radio frequency detector, or with the cltacts 14 and 15'which lead to the wired radio line. The intermediate frequency amplifier of' the superheterodyne is 'usted to the frequency at which the wired line is operated.

It will thus be seen se it is that in the event lthat desired to use the set-as a receiver for broadcastslgnalstheswitchlisthrownto gle instrumentality for reconnection with thel accom-4 .paratus the left into contact with the radio frequency detector, whereupon the apparatus functions purely as a superheterodyne receiver. On

the other hand, if it is desired to receive a wired radio program, it i's merely necessary to throw the switch 13 to the right as shown in the figure, whereby the wired radio signals are fed directly to the intermediate frequency amplifier and detector and subsequently to the audio frequency amplifier and loud speaker.

Obviously the changeover switch 13 may be wired in such a way as to light the filaments and close the plate circuits of the radio frequency portion of the equipment, when thrown to the left, or also to perform other switching operations incident to the use of a radio receiver. y

I claim as my invention:

1. In combination a radio receiver of the Y superheterodyne type having an intermediate. frequen amplifier, a wired radio receivn line, an meansselectively to'connect sai line to said amplifier.

. 2. In combination a' radio receiver of the superheterodyne tfrlype having an intermediatev i er, a separate source Aof frequency ampl signal oscillatlons operating at a frequency equal to the frequency of sald amplifier, and means selectively to connect-said source to said amplifier.

3. In combination a radio receiver having an amplifier stage operating at super-audible frequencies, an ampliier operating at radio frequencies, a line conducting signal oscillation at super-audible frequencies, and means 1 L: or NEW Yonx, N. Y., assmivon lro name conrom'rron' or selectively to connect said second mentioned amplifier or said line to said first mentioned amplier, whereby broadcast or wired radio programs maybe received on the same ap- 4. lncombination, means for collecting A space radiated signal energy,`a super-.

heterodyne receiver having an intermediate uen amplifier coupled thereto, a wired .radio line, and means for selectively connecting said line to said amplifier and simultaneously disconnecting vsaid collecting vmeans. therefrom.

JULIUS WEINBERGR. 

